It is surprising to learn that there are some people who develop allergic reactions to alcohol. The usual symptoms for allergies to alcohol include heart palpitations, headaches and feeling hot and are due to some ingredients found in wine, beer and spirits. To the few who have allergic reactions to alcohol, even an ml of pure alcohol is sufficient to start severe rashes, stomach cramps, collapse and even anaphylaxis.
It is the liver that breaks down alcohol into chemical, acetaldehyde and then acetic acid. When alcohol is not broken down, allergic reactions to alcohol may occur. Besides ethanol, alcoholic drinks have a mixture of grape, yeast, natural food chemicals, hop, barley and wood derived substances. And it is the proteins found in these grains and fruits that cause allergies in some people.
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